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Coexistence of superconductivity and ferromagnetism in defect-induced NbSe2 single crystals

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Abstract

Here, we report the coexistence of superconductivity (SC) and ferromagnetism (FM), which are considered as two exclusive phenomena. We have grown NbSe2 single crystals by chemical vapor transport method. In NbSe2, we have intentionally created Se deficiency (i.e., NbSe1.85) by substitution of Fe atoms (i.e., Fe0.0015NbSe-2). The temperature-dependent resistance measurements confirm that both Se and Fe defects decrease the superconducting transition temperature (Tc) due to the presence of disorder as well as enhancement of scattering phenomena of charge carriers. Subsequently, the temperature-dependent magnetization measurement gives the signature of coexistence of SC and FM in NbSe1.85. Interestingly, there is no such evidence in case of Fe0.0015NbSe2. The Tc and TFM are estimated from the derivative plot of DC susceptibility curves. It reveals that the bulk SC with FM in NbSe1.85 is obtained up to 0.05 T. Further, the M–H plot confirms the coexistence of SC and FM in NbSe1.85 at 2 K. In addition, the upper limit of superconductivity at different temperatures for NbSe1.85 and Fe0.0015NbSe2 is calculated which reflects the superposition region of SC and FM in NbSe1.85 and the suppression of the SC in Fe0.0015NbSe2 as compared to NbSe2. This study not only provides the role of defects in SC and FM properties but also encourages to study the effect of defects on other types of superconducting materials.

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Acknowledgements

This work was supported by Department of Science and Technology (SERB-DST), India, by acknowledging prestigious ‘Ramanujan Fellowship’ award (SR/S2/RJN-121/2012) and a CSIR support project (Grant No. 03(1349)/16/EMR-II) to PMS. PMS acknowledges Prof. Pradeep Mathur, Director of IIT Indore and SIC for providing accessibility to equipments for research. The author RP is grateful to DST for the esteemed SRF Inspire fellowship (DST/INSPIRE/03/2014/004196). The author MK thanks UGC-RGNF-JRF for admitting its meritorious fellowship. The author SA thanks DST (SERB, FIST, PURSE), BRNS, DRDO, UGC-SAP and CEFIPRA for assisting financially. The authors also convey gratitude to Dr. R. Rawat, Scientist, UGC-DAE Consortium for Scientific Research, Indore, for providing low-temperature four-probe resistivity measurement facility.

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Authors and Affiliations

  1. Discipline of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore, 453552, India

    Rukshana Pervin & Parasharam M. Shirage

  2. Centre of High Pressure Research, School of Physics, Bharathidasan University, Tiruchirappalli, 620024, India

    Manikandan Krishnan & Arumugam Sonachalam

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  1. Rukshana Pervin
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Correspondence to Parasharam M. Shirage.

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Pervin, R., Krishnan, M., Sonachalam, A. et al. Coexistence of superconductivity and ferromagnetism in defect-induced NbSe2 single crystals. J Mater Sci 54, 11903–11912 (2019). https://doi.org/10.1007/s10853-019-03757-5

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